Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6be6a720911fbb6…

MALICIOUS

PDF

66.4 KB Created: 2020-08-30 02:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c98c4542c61e46a925cf3ed45048f001 SHA-1: 9c6f6b0a97992b60282afe39c82d638764b92da3 SHA-256: d6be6a720911fbb67f0199695edfb1090e1e4060dc8d19d838dbb9980112db50
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=the+noble+experiment+jackie+robinson+summary. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=the+noble+experiment+jackie+robinson+summary
    • https://static.usrfiles.com/ugd/aff7ca_eefd008d94da46aa9fd82b661f3db161.pdf
    • https://static.usrfiles.com/ugd/bae363_207b82bd4de44c6b8cc5fe8f37c21628.pdf
    • https://static.usrfiles.com/ugd/12745a_046ac76df7564b97b2448324053b0bc9.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_22c8c4e620cf49ac80b64976b1f9ddfd.pdf
    • https://cdn.shopify.com/s/files/1/0438/9067/1771/files/causes_of_occupational_stress.pdf
    • https://cdn.shopify.com/s/files/1/0438/7821/9944/files/vabexagiginepinegeweka.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/lijokosokawuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujar.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/dugupififebova.pdf
    • https://cdn.shopify.com/s/files/1/0436/6408/1046/files/40619396186.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/sarerel.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/90618861429.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/443209828.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/naruto_online_oasis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c62d.bin
2ff1bcd59928351e1b4f66082dabbe533f02f94b12f35b45614b12b5dc0acf7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC62D 5572 bytes
font_01_sfnt_off0000d8f1.bin
0852c64ae992136825362b01138634c40b2965d3ef2522b04865e02d6e2a07c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 10316 bytes